Perforator for web-printing machines.



'Nm 634,255. Patented oeils, |899. n. c. ANNANn. PERFOI'IATR FUR WEB PRINTING MACHINES.

(Applicatin led Jan. 18, 1899.)

(No M'odel.)

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UNTTED STATES PATENT EETCE.

PERFORATOR FOR WEB-PRINTING MACHINES.v

SPECIFICATION forming part of Letters Patent No. 634,255, dated October 3, 1899.

Application filed January 18, 1899. Serial Non 702,516. (No model.)

T0 all whom t may concern: A

Be it known that I, ROBERT CUMMING AN- NAND, of South Shields, England, have invented certain new and useful Improvements in the Perforator Mechanism of Web-Printing Machines, of Which the following is a speciiication.

My invention relates to the perforator mechanism used in Web-printing machines for severing the Web of paper into sheets While it is passing through the machine.

The usual means employed to perforate or sever a web of paper into sheets consists of a pair of rotating rolls, one of Which carries the severing perforator-blade and the other has a longitudinal groove into which the perforator-blade passes at ythe moment of cutting off the sheet.

The perforator-blade is carried in a frame which is fastened into a longitudinal slot in the cylinder. There are usually two yielding pieces, generally called buffers, one on each side of the perforator-blade, which serve to press and hold the sheet against the opposite cylinder While the perforator-blade is forced through the paper and into the slot in the opposite cylinder. Spiral sprin gs are usually employed to force out these buffers at each side of the perforator-blade, and they are prevented from coming out altogether by means of pins put through the perforatorframe, there being corresponding slots in the buers through which the pins pass. The

springs are objectionable, as they are apt to break, and loose pieces of the springs are therefore liable to get about the sides of the buffers and jam them. The pins are also objectionable,because of the necessity of having slots and holes in the perforator-frame, the buffers, and the perforator-blade, and when it is necessary to put in a new blade these several details cause delay.

According to my invention I employ rubber disks to force out the buffers. I also form a lip or inturned iiange on the outer part of each half of the perforator-frame. ACorresponding with this lip there is a shoulder on the buffer, and this shoulder by coming against the lip effectually prevents the buffers from escaping.

In the accompanying drawings, Figure lis a longitudinal elevation of perforator mechbeing clamped between the halves.

anism constructed according to this invention. Fig. 2 is a section on the line A B of Fig. l. Fig. 3 is an elevation of the end O,

Fig. l.

a a a represent the perforator frame.

h is the perforator-blade, the edge of which is serrated, as usual.

c c are the buffers, made, preferably,of hard Wood.

d d are the rubber disks.

The perforator-frame is made in halves secured together by bolts ff, as shown. The perforator-blade is held rigidly in position by For convenience the buffers are in sections, as seen in Fig. 1. One of the rubber disks is placed at each end of the sections in a recess g in the lower part of the perforator-frame a. To make the disks more elastic, I form them with a hole 7L in the center.

e e are lips or inturned anges at the sides of the perforator-frame, and la le are shoulders on the buffers c, engaging With the said lips, so as to form a rigid stop to prevent the bnlfers rising farther than required.

The buffers c c have each a hollow t' at the middle of theirinner face to keep the rubber disks d d in a central position and prevent them rubbing on the perforator-frame d or perforatorb,and thereby damaging and shortening the life of the rubbers.

The construction of perforator hereinbefore described is simpler than what has hitherto been used, the rubber disks or the buffers can be more quickly renewed in case of Wear, the risk of injury from broken springs is avoided, and there is less risk of the buffers getting out of the holder than in cases where they are held in position by means of pins passing through slots in the Wood.

What I claim, and desire to secure by Letters Patent, is-

l. In perforator mechanism of web-printing machines, the combination with the buffers or yielding pieces at each side of the perforator-blade of rubber disks in the perforator-frame, said disks pressing elastically against the inner face of said buffers, substantially as and for the purpose set forth.

2. In perforator mechanism of Web-print`- ing machines, the combination with a perforator-blade, of a perforator-frame having in- IOO ner face in combination with rubber disks in the perforator-frame, the upper portions of said disks entering said hollows and pressing elastically against the inner face of said buffers, substantially as and for the purpose set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing Witnesses.

ROBERT CUMMING ANNAND.

Witnesses:

JOHN C. NEWBURN, ROBERT M. SPEARPOINT. 

